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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef66eb5db27a65c2a3860bfbd34103b7bde4193f6873c1b5b5ed7332880eab48' 
  AND token = 'hvhUb/q8vjHjEw3thnRs7918iiiEElJZbT6UofTxWSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}